WO2014199621A1 - Wireless communications system handover control method, relay device, and target cell selection method - Google Patents

Wireless communications system handover control method, relay device, and target cell selection method Download PDF

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Publication number
WO2014199621A1
WO2014199621A1 PCT/JP2014/003058 JP2014003058W WO2014199621A1 WO 2014199621 A1 WO2014199621 A1 WO 2014199621A1 JP 2014003058 W JP2014003058 W JP 2014003058W WO 2014199621 A1 WO2014199621 A1 WO 2014199621A1
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cell
base station
information
relay device
handover
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PCT/JP2014/003058
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French (fr)
Japanese (ja)
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昌志 中田
佳央 植田
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日本電気株式会社
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Publication of WO2014199621A1 publication Critical patent/WO2014199621A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/04Reselecting a cell layer in multi-layered cells
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission and use of information for re-establishing the radio link
    • H04W36/0061Transmission and use of information for re-establishing the radio link of neighbor cell information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/34Reselection control
    • H04W36/38Reselection control by fixed network equipment
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24Cell structures
    • H04W16/32Hierarchical cell structures
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04Large scale networks; Deep hierarchical networks
    • H04W84/042Public Land Mobile systems, e.g. cellular systems
    • H04W84/045Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04Large scale networks; Deep hierarchical networks
    • H04W84/042Public Land Mobile systems, e.g. cellular systems
    • H04W84/047Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations

Abstract

[Problem] To provide: a handover control method capable of identifying a target cell in a hand-in phase, even in a network configuration having relay devices connected in multiple stages; a relay device; and a target cell selection method. [Solution] A wireless communications system having a base station control device (14) and a first relay device (1) connected to a communications network, at least one first base station (12) connected under the control of the base station control device, at least a second relay device (2) connected under the control of the first relay device, and at least one second base station (4-6) connected under the control of the second relay device, and wherein: the first relay device obtains cell information for a cell controlled by a second base station under the control of the second relay device; and, the first relay device identifies a target cell for handover by using the cell information, in a hand-in phase in which a wireless station (16) hands over from a wirelessly connected first base station (12) to a second base station (6).

Description

Handover control method in a wireless communication system, a relay device and a target cell selection method

The present invention relates to a handover control technique in a wireless communication system, a target cell selection method of handover in a particular repeater.

In 3GPP (3rd Generation Partnership Project), to define the HNB (Home Node B) as a small-sized base stations can be placed in an office or in a user's home, the user terminal through the HNB: access to operator network (UE User Equipment) It is possible. Since wireless area one HNB to cover a narrow range such as office or customer premises, small cell, micro cell, femto cell, also referred to such as picocells. For convenience, it is assumed to use a "femto cell" as including these cells. Such femtocells are generally a number set in the macro cell (Macrocell) covering a wide area.

PSC as physical cell identification information in 3GPP cell (Primary Scrambling Code) are defined, each cell is capable of identifying a cell by using different PSC respectively, logic cell identification information of the cell from the PSC (Cell Identity) It is tied to. However, the number of physical cell identification information is limited for example, UMTS (Universal Mobile Telecommunications System) in the PSC up to 512, in LTE (Long Term Evolution) System, PCI (Physical Cell Identity) is a 504 amino maximum . For this, PSC for femtocells are many set in macrocell are overlapping use, it can not be linked uniquely to Cell Identity from PSC. This has become a cause of the ambiguity of the PSC. Specifically, prior to 3GPP Release 9 legacy UE, that is, when the UE does not support function (SI Acquisition function) for acquiring system information of a cell other than the cell in a radio connection (System Information), the handover source RNC (Radio network Controller) of the macro network is can not determine the target cell corresponding to the PSC reported by the UE uniquely. Such ambiguity of the PSC (= PSC Confusion) how to solve (Disambiguation) is disclosed in Non-Patent Documents 1 and 2.

As an example the system shown in FIG. 1, will be described PSC ambiguity resolution in RNC and HNBGW (HNB Gateway).

According to A) PSC ambiguity resolution non-patent document 1 Addendum C.2, in RNC (75 ~ 76 pages), first, as a first step, the UE femto cells connected to HNB femtocell in the process of handover to the macrocell (handout), stores RNC the necessary information in the database. Subsequently, as a second step, performing a specific target cell (femtocell) by using the database information when the UE hands in.

Specifically, in a first step, the UE located in the femtocell sends a measurement report (Measurement Report) to the HNB, receives it HNB sends a handover request message to the RNC via the HNBGW. The RNC stores information of the handover request message to the database learning. The database information, the logic cell identification information of the femtocell (Cell Identity) and its PSC, Cell Identity macrocells under RNC and the time difference of the PSC, and the reference time of the femto cell and macro cell measured by UE (Delta the Observed Time Difference: Delta_OTD) are included.

Subsequently, in a second step, when receiving a Measurement Report from the UE located in the macrocell, RNC obtains the Cell Identity of the femto cell to be handover target from the database information, handover via HNBGW to HNB of the femtocell It sends a request message. The handover request message, but Cell Identity of the femtocell is set, the Cell Identity is a Cell Identity, which is set to UE History Information handover request message in the handout first step.

According to PSC ambiguity resolution non-patent document 1 Supplement Section C.3 (76 ~ 77 pages) in B) HNBGW, it is basically the same as the method of solving in C.2 Chapter RNC, the database point location is saved is HNBGW is different.

In a first step, but the handover request message is sent from the HNB, as described above, HNBGW When receiving the handover request message, and building a database information from the message and forwards the handover request message to the RNC. The database information, the logic cell identification information of the femtocell and (Cell Identity) that PSC, includes delta_OTD information Cell Identity macrocells under RNC and its PSC, and femtocell and its neighboring macrocells. delta_OTD represents the time difference between the reference time of the macro cell and the femto cell measured by UE.

Subsequently, in a second step, UE sends a Measurement Report to the RNC, RNC sends a handover request message including a Measurement Report to HNBGW. HNBGW selects femtocell handover target from the Cell Identity and the Measurement Report and database information built set in UE History Information of handover request message, transmits a handover request message to the HNB of the femtocell.

3GPP TS 25.467 V11.1.0 (2012-12) UTRAN Architecture for 3G Home Node B (HNB) Stage 2 (Release 11) corresponding location: Annex C 3GPP TR 37.803 V11.1.0 ( 2012-12) Universal Mobile telecommunications System (UMTS) and LTE; Mobility enhancements for Home Node B (HNB) and Home enhanced Node B (HeNB) (Release 11) relevant part: 6.1.3 Chapter Legacy UE Mobility

However, PSC ambiguity resolutions A and B described above, the HNB registered in HNBGW as shown in FIG. 1 is applicable to a case composed of one cell. As shown in FIG. 2, HNBGWb is registered in HNBGWa, the structure where a plurality of HNBb1, HNBb2 are connected under the addition HNBGWb, when it is not possible to identify the handover target cell as described below may occur.

Applying PSC ambiguity resolutions A in RNC to the system shown in FIG. 2, in the first step of the RNC to build a database, a Cell Identity, which is set to UE History Information handover request message at the hand-out , Cell Identity of Cell Identity or HNBb2 of HNBGWb is set.

A. 1) If the Cell Identity of HNBGWb the UE History Information is set, HNBGWa is identifiable Cell Identity of HNBGWb, HNBGWb what HNB under can not identify whether a handover target cell.
A. 2) If the Cell Identity of HNBb2 the UE History Information is set, only Cell Identity of HNBGWb is the HNBGWa know, does not know the Cell Identity of the HNB working under its, HNBGWa's HNBb2 Cell also look at the Identity, do not know whether it is sufficient to send a handover request message to any HNB or HNBGWb.

Thus, the database information of the RNC that was constructed by handout, it is impossible to realize a hand-in to a femto cell under the control HNBGWb shown in FIG.

Applying PSC ambiguity resolution B in HNBGW to the system shown in FIG. 2, in the first step of constructing the database, the Cell Identity that has been set in the UE History Information handover request message during handout HNBGWb Cell Identity of Cell Identity or HNBb2 is set.

B. 1) If the Cell Identity of HNBGWb to UE History Information has been set, HNBGWa can not know the PSC of the cell of HNBb2 because what is a hand-out from any HNB under the HNBGWb do not know, sent from the UE not be able to identify the OTD of the cell of HNBb2 from has been Measured Result. This can not be calculated delta_OTD about the femtocells and subordinate RNC macrocells HNBb2 for.
B. 2) If the Cell Identity of HNBb2 the UE History Information is set, HNBGWa the Cell Identity only information PSC of HNBb2 do not know without the HNBb2. For this reason, it is impossible to identify the OTD of the cell of HNBb2 from Measured Result. As a result, it is impossible to calculate the delta_OTD and to a macrocell a femto cell and subordinate RNC of HNBb2.

For this, HNBGWa from the handover request message received at the second step, it is impossible to obtain specific information capable HNBGWb and HNBb2 also refers to database information. That is, in the database information HNBGWa constructed by the hand-out, it is impossible to realize a hand-in to a femto cell under the control HNBGWb shown in FIG.

As described above, PSC ambiguity resolution, as described in Non-Patent Documents 1 and 2 are only practically possible in the configuration of a base station connected to HNBGW as shown in FIG. 1 has a single cell , and the in the network configuration having a multi-stage configuration of HNBGW-HNB as shown in FIG. 2, it may not identify the target cell in the hand-in phase.

An object of the present invention may be a network configuration to which the relay device is connected in multiple stages, a handover control method capable of specifying a target cell for hand-in phase, to provide a relay device and a target cell selection method It is in.

Handover control method according to the present invention, the base station controller and the first relay device is connected to the communication network, at least one first base station is connected under the base station controller, under the first relay device at least a second relay device is connected, the a handover control method in a radio communication system in which at least one second base station is connected under the second relay device, the first relay device, the second acquires cell information of the cell the second base station subordinate to the relay device controls, in hand-phase handover to the second base station radio station from said first base station in a radio connection, the first relay device, by using the cell information to identify the target cell of the handover, characterized in that.
Relay device according to the invention, the base station controller is connected to a connected communication network, a relay apparatus in which at least lower relay device is connected under the first at least one under the base station controller the base station is connected, wherein At least one of the second base station is connected under the lower relay device, a storage unit for storing the cell information of the cell the second base station subordinate to the lower relay device controls in hand-in phase of the handover to the second base station radio station from said first base station in a wireless connection, by using the cell information, and a control means for specifying a target cell of the handover, to have a and features.
Target cell selection method according to the invention, the base station controller and the first relay device is connected to the communication network, at least one first base station is connected under the base station control apparatus, the first relay device at least a second relay device is connected under, a target cell selection method in the first relay apparatus in a wireless communication system in which at least one second base station is connected under the second relay device, storing means but stores the cell information of the cell the second base station controls subordinate to the second relay device, the control means, the radio station is handed over to the second base station from said first base station in a radio connection in hand-in phase, selects a target cell of the handover using the cell information, and wherein the.
Wireless communication system according to the present invention, the base station controller and the first relay device is connected to the communication network, at least one first base station is connected under the base station controller, under the first relay device at least a second relay device is connected, a second relay device a wireless communication system in which at least one second base station is connected under the said first relay device, subordinate to the second relay device the second base station acquires the cell information of the cells that control of, the hand-phase radio station handover from the first base station in the radio connection to the second base station, said first relay device, said using the cell information to identify the target cell of the handover, characterized in that.

According to the present invention, the first relay device acquires cell information of the second base station in the second relay device subordinate in hand-phase to the cell of the second base station, by using the acquired cell information , allows certain target cells that are connected under the second relay device of the target cell side.

Figure 1 is a block diagram showing a system architecture for describing the background art. Figure 2 is a block diagram showing a system architecture for describing the problems of the background art. Figure 3 is a block diagram showing an example of the architecture of a wireless communication system according to an embodiment of the present invention. Figure 4 is a block diagram showing the schematic configuration of the first relay device in this embodiment. Figure 5 is a block diagram showing the schematic configuration of the second relay device in the present embodiment. 6 is a sequence diagram of handover control operation of the wireless communication system according to this embodiment. Figure 7 is a schematic diagram showing an example of information stored in the database in the embodiment. Figure 8 is a block diagram showing an example of the architecture of a wireless communication system for explaining the embodiments of the present invention. Figure 9 is a sequence diagram showing a handover target cell selection method according to a first embodiment of the present invention. Figure 10 is a schematic diagram for explaining a format of HNB registration request message in the first embodiment. Figure 11 is a schematic view for explaining the format of the HNB configuration update message in the first embodiment. Figure 12 is a flowchart showing a registration operation of the cell information in the first embodiment. Figure 13 is a schematic system configuration diagram showing a sequence of hand-phase in the first embodiment. Figure 14 is a flowchart illustrating a search and cell characteristic operation using the database in the first embodiment. Figure 15 is a flowchart showing a filtering operation in FIG. Figure 16 is a flowchart showing a hand-out operation in the first embodiment. Figure 17 is a sequence diagram showing a hand-out phase in the handover target cell selection method according to a second embodiment of the present invention. Figure 18 is a schematic system configuration diagram showing the sequence of a hand-out phase in the second embodiment. Figure 19 is a flowchart showing a registration operation of the cell information in the second embodiment. Figure 20 is a flowchart of a cell information registration operation at the time of the hand-out in the second embodiment.

Network of applying the embodiments of the present invention, networked base station controller is connected to the plurality of the first base station under its control, the first relay device that is connected to the same network and the base station under its control connecting the second relay device, further the second relay device is assumed to be connected to the plurality of the second base station under the. In the network of this multi-stage configuration, the radio station is a hand-in from a first base station under the base station controller to a second base station of the second relay device under is performed as follows. First, the first relay device acquires cell information of the second base station in the second relay apparatus under. When the radio station receives a handover request to hand in to the cell of the second base station, the first relay device, by using the cell information registered, connected under the second relay device in the target cell side the second base station is a target cell that is can be specified. It will be described in detail an embodiment and examples of the present invention.

1. One embodiment 1.1) System configuration FIG. 3 shows an example of a multi-stage network topology for a wireless communication system according to an embodiment of the present invention is applied. However, in order to avoid complication of explanation, one base station 10 and one relay device under one relay device (the first relay device 1) (second relay device 2) and that is connected to. Without being limited to this, and a plurality of base stations and under the first relay device 1 a plurality of relay devices may be connected, is under the control of the first relay device 1 a base station is not established even one it may be in the form.

3, the base station 10 controls the cell 11, the second relay device 2 connects the plurality of base stations under its (here three base stations 4-6), the base station 4-6 cells 7-9 the control, respectively.

The first relay device 1 is connected to the base station controller 14 and a core network 15, the base station 12 connected to the base station controller 14 and controls the cell 13. Cell 13 is a cell that covers a wide range, it is assumed that the cell 7-9 and the cell 11 is adjacent to the cell 13. For example, the cell 13 is a femtocell macrocell, cells 7-9 and cells 11 are adjacent to a macrocell 13. The radio station 16 is mobile station movable between cells, the user terminal, and the like portable terminal.

In FIG. 3, the cell 7-9 in under the second relay device 2, the base station controller 14 as viewed from, the second relay device 2 is handled as one virtual cell 3 constructed. A virtual cell, the base station controller 14 or the first relay device to a cell of a 1 seen from one management unit, a plurality of base stations or the first relay device within the cell by the base station controller 14 manages 1 or more cells second relay device 2 is controlled by means of what was regarded as virtually one cell. Therefore, when viewed from the base station controller 14, it can be handled as well one virtual cell that collectively virtual cell 3 as well, and the cell 11 in addition to the cell 7-9.

According to this embodiment, cell information about the cell 7-9 subordinate to the second relay device 2 is registered in the first relay device 1 of the database in some way. If the wireless station 16 of the wireless connection in the base station 12 of cell 13 is hand-from the cell 13 to the cell 9, the first relay device 1 receives the handover request from the base station controller 14, it is registered in the database by referring to the cell information, it is possible to target cell of the handover can be known to be a cell 9 of the second relay device under 2, and transmits a handover request through the second relay device 2 to the base station 6 .

1.2) as shown in diagram 4 of the relay apparatus, the first relay device 1 includes a communication unit 101, a lower communication part 102, protocol message construction unit 103, a database 104 and controller 105.

First relay device 1 can replace the base station controller 14 and a core network 15 and the message by the communication unit 101 exchanges the base station and the second relay device and the message under the lower communication part 102.

Protocol message construction unit 103, the base station controller 14, a core network 15, the construction and analysis of exchange protocol messages with the base station 10 and the second relay device 2 subordinate performed. A specific example of a protocol message will be described in Examples below.

Database 104 The following information: 1) cell identity (Cell Identity) corresponding to the address of the base station or the second relay device 2 to build the PSC and the cell of the cell from the characterizing registration table; 2) a base station or a 2 relay device 2 of the neighboring cell information; 3) virtual cell identity (cell Identity that is mapped to a virtual cell (cell Identity) from the cell 13); and 4) Delta_OTD table, stores to manage. Of these, the information 3), the mapping information from the cell 13 to the virtual cell (Cell Identity) is given manually by the operator as a system parameter of the first switching device 1 O & M. The virtual cell identity (Cell Identity), the base station controller 14 the base station subordinate PSC handover target cell in the Measurement Report received from the UE in the first relay device 1, the second relay device or the second relay to indicate any cell of the base station under the device, a cell Identity, which is set as a handover destination in handover table of the base station controller 14 (target cell Identity). As described later, in the base station registration, the first relay device 1 receives the base station registration request message from the base station or the second relay device 2 subordinate through the lower communication part 102, information contained in the message database It is recorded in 104. It will be described later in detail database 104 (see FIG. 7).

The control unit 105 controls the operation of the first relay device 1, as will be described later, the construction of database information, protocol processing, for performing the operations of routing, etc. of the handover request message. Note that the protocol message constructing unit 103 and the control unit 105 function equivalent to the can also be implemented by executing a program stored in a memory (not shown) on a computer (processor).

As shown in FIG. 5, the second relay device 2 includes a host communication part 201, a base station communication unit 202, protocol message constructing unit 203, the subordinate base station information storage unit 204 and the control unit 205, upper relay device exchanges protocol messages between the base station and UE under.

The second relay device 2, first replace the relay apparatus 1 and the message by the upper communication part 201, and transmits the reception and protocol messages of the measurement report from the base station under the base station communication unit 202.

Protocol message constructing unit 203 performs the construction and analysis of exchange protocol messages between the first relay apparatus 1 and the subordinate base station. A specific example of a protocol message will be described in Examples below.

Under the base station information storage unit 204 stores base station information of the base station 4-6 in the subordinate of the second relay device 2 (cell information). Cell information, cell identification information, PSC, and the like address and neighboring cell information.

The control unit 205 controls the operation of the second relay device 2, as described below, the notification processing of the cell information, performing the operations of routing, etc. of the handover request message. Note that the protocol message constructing unit 203 and the control unit 205 and the equivalent function can also be realized by executing a program stored in a memory (not shown) on a computer (processor).

1.3) As shown in handover control Figure 6, the handover control according to the present embodiment is divided into a selection operation of a handover target cell after receiving the measurement report from the registration / update operation and a terminal of the cell information.

<Registration of cell information / update>
6, the control unit 205 of the second relay device 2 reads the cell information of the base station 4-6 under (cells 7-9) from under the base station information storage unit 204, cell information in the protocol message constructing unit 203 It constructs a notification message, and transmits through the upper communication part 201 to the first relay device 1 (operation S20). Notification of the cell information may be any method, as described below, and a method utilizing the method and hand-out phase of the protocol messages using a registration request / update message.

The first relay device 1 of the control unit 105 receives the cell information notification message through the lower communication part 102 extracts the cell information from the received message, the base station and the second relay device 2 subordinate cell under the control of the database 104 information relating to registration at a predetermined table format (operation S21). Control unit 105, every time the second relay device 2 further notice of cell information, it is possible to update the registration information database 104.

<Selection of the handover target cell>
6, the base station controller 14 receives the measurement report (Measurement Report) from the UE located in the cell 13 (operation S22), and identifies the target cell identification information and destination from the measurement report, the handover source transmitting a handover request message including the information as the measurement report information about the cell 13 is a cell to the first relay device 1 (operation S23).

When the first relay device 1 is received by the communication unit 101 a handover request message, the control unit 105 searches the database 104 using the cell information such as the target cell identification information and the source cell identification information included in the handover request message, the handover a request message identifying a second relay device 2 and the target cell 9 to be transferred (operation S24).

Thus the path to the target cell 9 is identified, the control unit 105 sends a handover request message through the lower communication part 102 to the base station 6 of the target cell 9 (operation S25), from the source cell 13 to the target cell 9 hand-in process of is executed (operation S26).

1.4) as shown in the database information Figure 7, the database 104 provided in the first relay device 1, as one example, the base station registration table, the virtual cell ID table and cell information and the time difference table is stored .

The base station registration table is constructed by on the basis of the registration request / update message or a handover request message received from the base station or the relay device located under the first relay device 1, and registers the cell identification information, PSC and address is a table that is. Network of the embodiment shown in FIG. 3, for example with respect to the base station 10, the address of the Cell Identity, PSC and the base station 10 of the cell 11 is registered as one record. Further, with respect to the second relay device 2, Cell Identity, PSC and the second address of the relay device 2 of the virtual cell it is not registered. Also, for each of the base stations 4-6 under the second relay device 2, Cell Identity, PSC and the second address of the relay device 2 of each cell 7-9 it is registered.

Virtual cell ID table, based on the registration request / update message or a handover request message received from the base station or the relay device located under the first relay apparatus 1, under the first relay device 1 or the second relay device 2 an adjacent macrocell certain base station, which is constructed by registering the virtual cell, the mapping corresponding to a plurality of cells of base stations in the first relay device 1 or the second subordinate relay apparatus 2 viewed from the macrocell it is a table. May be mapped from one macrocell to a plurality of virtual cells, a plurality of macrocells may be mapped to one and the same virtual cell. Since one virtual cell 3 present in the macro cell 13 is a network of this embodiment shown in FIG. 3, it is mapped from mCell_ID macrocell 13 to vCell_ID virtual cell 3.

The cell information and time difference table, with the base station or registration request / update message received from the relay apparatus or the handover request message and the base station registration table and a virtual cell ID table in under the first relay device 1, each respect femtocell, information of the femto cell and macro cell (identification information, PSC) and, delta_OTD the macrocell - and (macro time difference between the reference time between femtocells), a list of delta_OTD with other cells (additional information) , composed of. A specific method of calculating delta_OTD are described in the Examples.

1.5) Effects As described above, according to this embodiment, the cell identification information about the cell 7-9 subordinate to the second relay device 2, the cell information including PSC information and address information or OTD In addition to these, information, cell information also includes information such as that indicating the relationship between the neighboring cells, it is registered in the first relay device 1 of the database of the upper. If the wireless station 16 of the wireless connection in the base station 12 of cell 13 is hand-from the cell 13 to the cell 9, the first relay device 1 receives the handover request from the base station controller 14, it is registered in the database by referring to the cell information, even if the PSC is duplicated used, it is possible to know the target cell of the handover is cell 9 of the second relay device under 2, the base station 6 through the second relay apparatus 2 to be able to send a handover request.

2. Wireless communication system As an example, be described in detail the embodiments of the present invention by using the wireless communication system shown in FIG. Wireless communication system shown in FIG. 8 is assumed to have a network configuration corresponding to the system shown in FIG. 3, a detailed description of each device are labeled with the same reference numerals to the corresponding device will be omitted.

Corresponding components of the Figure 8 and Figure 3 is as follows. GW (gateway) 1 and GW2 is the first relay device 1 and the second relay device 2 in FIG. 3 in FIG. 8, HNB (Home NodeB) 4-6 and 10 to the base station 4-6 and 10, the base station 12 but the NodeB12, the base station controller 14 RNC (radio Network controller) 14, UE16 within the radio station 16, the corresponding. Further, macro cell 13 to the cell 13, the cell 7-9 and 11 correspond respectively to the femtocell 7-9 and 11. As already mentioned, the under the GW1 can connect multiple HNB, a plurality of GW, 8 only illustrates the respective one HNB GW and to avoid complexity of the drawing Absent. HNB it is also possible to connect only one or more GW not connected.

8, the radio base station system is comprised of NodeB12 and RNC14 that controls a plurality of NodeB is a public radio base station that covers the generally broad scope. NodeB12 constructs a macrocell 13 as a communication area. RNC14 controlling the NodeB12 is connected to the core network 15, including MSC (Mobile Switching Center) or SGSN (Serving GPRS Support Node), which is connectable to the GW1 as described below.

HNB4-6 and 10 is a small radio base station that covers a generally narrow range in one node. The installation location of the HNB, not homes only, condominiums, a commercial building, shopping mall, street lights of downtown or the like, it is possible to build a wide communication area by one or more of HNB.

GW2 is a gateway device that enables it to connect multiple HNB directly relays between the HNB system and GW1 comprising a plurality of HNB4-6. GW2 is taken GW1, function as one HNB similar to HNB10. In other words, under the GW2 despite the presence of the cell 7-9 HNB4-6 to build each cell identification information assigned to GW2 (Cell Identity) virtually one cell (virtual cell 3) It is considered to be.

UE16 while receiving a reference signal from a neighboring cell (pilot signal) can perform a handover between cells, hereinafter, handover operation between the macrocell 13 and the femtocell 9 will be described in detail. Incidentally, in the hand-out phase a femtocell 9 source cell, macro cell 13 target cell, a hand-in phase macrocell 13 source cell, femto cell 9 is the target cell.

The GW1, HNB identification information (ID) that is assigned one by one to the HNB, holds the cell identity (Cell Identity) and PSC information. HNB10 builds only one cell 11, are set different PSC value with neighboring cells in the cell 11. Similarly, GW1 is HNB identification information assigned one by one to the GW 2, the cell identity Cell Identity, holds the PSC information. However, PSC assigned to GW2 need not be the same as the PSC value of the cell 7-9 HNB4-6 under, also GW2 may not hold the PSC information.

Further, at the time of registration of the HNB and GW 2, be included in the message HNB identification information and cell identification information is received from the subordinate apparatus, GW1 be subordinate apparatus to determine HNB or GW from HNB identification information and cell identification information it is also possible.

GW2 is connectable to a plurality of HNB (4, 5, 6), holds the cell identification information and the PSC information assigned one by one each HNB under these. PSC may be utilized the same value to identify the UE16 cell, adjacent cells are set to generally different PSC value. GW2 can be handled as if it were one of the virtual cell 3 together cells 7,8,9, when registering the GW1, GW2 of the registration message (3GPP TS 25.469 V11.1.0 (2012-12) setting the identification information of the virtual cell 3 in UTRAN Iuh interface Home Node B (HNB) Application Part (HNBAP) signalling (Release 11) reference). However, PSC since there always may optional parameters need not be set, GW 2 may not set the PSC information of the virtual cell 3 to the registration message of GW 2.

Also, RNC 14 can be connected to the plurality of NodeB well one NodeB12, cells 13 NodeB12 is constructed larger than the cell 7,8,9,11, also to include some or all of possible it is. Also, RNC 14 is connected with the GW1 via the core network 15, it is not limited thereto, and RNC 14 and GW1 may be connected directly.

3. According to a first embodiment of the first embodiment the present invention, the database information of GW1 is constructed using the cell information included in the HNB Registration Request / Update message received from the GW 2.

<Registration of cell information / update>
9, the control unit 205 of the GW2, the cells containing information cell identification information of HNB4-6 under from under the base station information storage unit 204 (cell 7-9) relates to PSC and neighbor cell (PSC and delta_OTD etc.) read information, the protocol message constructing unit 203 constructs the HNB registration message (HNB rEGISTER REQUEST), and transmits through the upper communication part 201 to GW1 (operation S30). It will be described later HNB registration message (see Figure 10).

Control unit 105 of the GW1 receives the HNB registration message through the lower communication part 102, the HNB registration message extraction cell information from the registration information about the subordinate cell HNB and GW2 under a predetermined table format in the database 104 to (operation S31). The control unit 205 of the GW2, configuration of HNB system under (HNB expansion of degrowth) changes, Cell Identity, PSC, when there is a change of Delta_OTD information with neighboring macrocell and neighboring macro cell, under the base station information storage unit update the 204 information (operation S32), the protocol message constructing unit 203 using the cell information updated by building a HNB update message (HNB CONFIGURATION uPDATE), transmits through the upper communication part 201 to GW1 (operation S33 ). Control unit 105 of the GW1 reception of each HNB update message from GW 2, and updates the registration information database 104 (operation S34). It will be described later HNB update message (see Figure 11).

<Selection of the handover target cell>
Subsequently, RNC 14 is the measurement report from the UE16 located in the cell 13 receives the (Measurement Report) (operation S35), and identifies the target cell identification information and destination from the measurement report, information about the macro cell 13 as the source cell and transmitting a handover request message including the measurement report information to GW1 (operation S36).

If GW1 is received by the communication unit 101 a handover request message, the control unit 105 searches the database 104 using the target cell identification information included in the handover request message, the cell information such as the source cell identification information, forwards the handover request message It should do GW2 and identifying the femtocell 9 (operation S37).

Thus the path to the target cell 9 is identified, the control unit 105 sends a handover request message through the lower communication part 102 to HNB6 femtocell 9 is a target cell (operation S38), the femto cell from the macro cell 13 9 hand-in process to is executed (operation S39).

3.1) When HNB registration request / to the update message GW2 from GW1 as a message for transmitting the cell information using the HNB registration message, be one or more sets of combination of cell identity (Cell Identity) and PSC of HNB possible it is. Furthermore, it is also possible to include delta_OTD information between each HNB and one or more neighboring cells.

As shown in FIG. 10, the Local Cell Information of HNB registration message, information about a plurality of cells in under the GW2 is stored. That, Local Cell Information on cell identification information Cell-ID and PSC of each subordinate cell, neighboring cell information of each subordinate cell (PSC and Delta_OTD) are respectively included in further Neighbor Information. In this embodiment, the cell identification information Cell-ID and PSC of the plurality of femtocells 7-9 to Local Cell Information, and the PSC and delta_OTD macrocell 13 adjacent to the Neighbor Information is stored. Further, may be included Cell ID in the neighbor cell information under the cell in the Neighbor Information, the accuracy of the database search described above (operation shown in FIG. 9 S37) is high in that case. Further, in the registration of the cell information and the time difference table in operation S31 / S34 described above, it is possible to acquire the macro cell ID.

GW2 can know delta_OTD the HNB and macro cells 13 under in neighboring cell measurement of the HNB under. At that time, when displaced from delta_OTD notified to the first or last more than a predetermined threshold value, it may be sent as update information. Incidentally, it is possible to consider may deviate several chips by drift of the Cell reference signal by radio wave propagation distance and long operational some latitude to the value of delta OTD for determining whether the same or not. For example, the width for Delta_OTD 1000, when Delta_OTD value is 10000, the value of Delta_OTD 9000 to 11000 determines that cell with the information of the same Delta_OTD. In this case, the predetermined threshold for the comparison, it is desirable to have a width equal to or less than the width of Delta_OTD.

Further, since the provided a width delta OTD is determined that the same deviation occurs in OTD due to the propagation distance difference due to the location of handovers within a cell different, as a result, deviation occurs in delta_OTD information even, it can be determined that the same cell, it is possible to increase the probability of identifying a target cell. Further, the same effect can be obtained were slightly shifted with respect to the transmission timing of the reference signal of a cell after a long-term operation of the cell.

As a message for transmitting the cell information from the GW2 to GW1, it can also be used other messages HNB registration message. For example, as shown in FIG. 11, the Sector Information of HNB update message, the Sector the List of all HNB under the GW 2, Sector the List is additionally connected to the GW 2, and Sector the List being Sector the List and deleted is changed it is also possible to transmit topped with. The Sector Information, as in the case of registration message, the cell identification information Cell-ID and PSC, and the PSC and delta_OTD macrocell 13 adjacent to the Neighbor Information is stored.

The following describes registration operation of the cell information using the HNB registration message (HNB REGISTER REQUEST).

In the registration phase 12 3.2) cell information, first, the GW2 sends the HNB REGISTER REQUEST message to GW1. The HNB REGISTER REQUEST message, as illustrated in FIG. 10, mainly includes the following information:
- HNB ID
- Cell Identity
- PSC
- HNB or GW2 neighborhood of Macrocell information of HNB under.
Other information will be omitted in this embodiment is not directly related.

When the low communication part 102 of GW1 receives the HNB REGISTER REQUEST message (operation S301), the control unit 105 carries out a normal HNB registration procedure (operation S302).

Subsequently, the protocol message constructing unit 103 determines whether the registered node is a GW2 having a plurality of cells or a HNB having only a single cell (operation S303). The identification determination, parameters HNB REGISTER REQUEST message, can be used, for example the source of the IP Address and port number of the received message. Other than this, it is possible to distinguish even example string information included in the HNB ID, the cell identity (Cell Identity) or PSC information.

If HNB that registered node has a single femtocell (operation S303; NO), the control unit 105 registers Cell Identity of HNB, a combination of PSC and Address to the base station registration table of the database 104 ( operation S304).

If GW2 that registered nodes makes it possible to have a plurality of femto cells (operation S303; YES), whether the protocol message construction unit 103 includes a Local Cell Information on HNB REGISTER REQUEST message received determines whether or not (operation S305). If it contains Local Cell Information (operation S305; YES), the control unit 105 registers Cell Identity of HNB, the Address combination of PSC and GW2 to the base station registration table of the database 104 (operation S306). Incidentally, if it contains delta_OTD information between each HNB and at least one neighbor cell, may register the delta_OTD information in the cell information and time difference table. Local If Cell Information does not include (operation S305; NO) if or the operation S304 is completed, operation S306 is not executed.

Subsequently, the control unit 105 determines whether the macrocell adjacent to the HNB / GW to HNB REGISTER REQUEST message received is set (operation S307). If the macrocell is set (operation S307; YES), the control unit 105, in addition to the information of the HNB / GW, and saves the neighboring macro cell information in a database (operation S308). In this way, it is possible to register the table information as illustrated in FIG. 7 in the database 104.

3.3) hand-in phase Next, with reference to FIGS. 13 to 15, UE 16 will be described operation of the hand-in phase of a handover from a macro cell 13 to the femtocell 9. The operation S35 ~ S38 shown in FIG. 13 respectively correspond to the operation S35 ~ S38 of FIG. 9.

In Figure 13, UE 16 while NodeB12 wirelessly connected within macrocell 13, a PSC Cell9 from the pilot signal of the femtocell 9, the PSC Cell13 from the pilot signal of the macrocell 13, respectively receive. In this case, towards the pilot received power of a femto cell 9 on the basis of the measurement results, such as greater than that of the macrocell 13, UE 16 transmits a Measurement Report (measurement report) message to the RNC 14 (operation S35).

The Measurement Report, contains the Event the Result (event results) Measured the Result (measurement result), the Event the Result is set PSC Cell9 femtocells 9, the Measured the Result, information on the femtocell 9 (PSC Cell9 , a reference time difference OTD Cell9 time) between the UE 16 and the femtocell 9, information about the macro cell 13 (PSC Cell13, UE16 and time difference OTD of the base time of the macro cell 13 Cell13), is set. A time difference OTD to be handled here includes a femtocell 9 and the primary CCPCH (Common Control Physical Channel) of a physical channel of the macrocell 13 SFN (System Frame Number), and Frame Offset of the RLC Transparent Mode of COUNT-C of the UE16 a Chip Offset. 3GPP TS25.331 V11.4.0 (2013-1) Radio Resource Control (RRC); the Protocol specification (Release 11), the OTD is represented by three parameters of COUNT-C-SFN high, OFF and Tm.

Upon receipt of the Measurement Report message, RNC 14 uses the handover routing table provided in the inside, from the PSC Cell9 of Event the Result, the cell belonging to the target cell is GW1 (here either included in the virtual cell 3 cell determining that) is, RANAP to the core network 15: Relocation required (handover request) message (operation S36). The Relocation Required message,
1) Target ID (target identification information)
2) Target Cell Identity (target cell identity)
3) UE History Information (terminal history information)
4) Source RNC to Target RNC Transparent Container (source - target RNC between the transparent container)
There is set. Here, the identification information of the Target ID GW1 is, cell identification information under the Target Cell The Identity GW1 (virtual cell ID) is set, respectively. Furthermore, the cell in the UE History Information, and Cell Identity cells UE16 has visited as IE Cell Identity, a set of the IE UE Stayed in Cell time UE16 in the cell stayed as, the UE16 is located in the past each time, is set. Also, the Source RNC to Target RNC Transparent Container is set Measurement Report received from the UE 16.

GW1 is from the core network 15 RANAP: Relocation Request (handover request) to receive a message (operation S36). RANAP: the Relocation Request message,
1) Target Cell Identity
2) UE History Information
3) Source RNC to Target RNC Transparent Container
There is set. Here, Target Cell Cell Identity showing GW1 the cell under the control of a (virtual cell) on the Identity is set, the Source RNC to Target RNC Transparent Container is set Measurement Report received from the UE 16.

GW1 is RANAP: receives the Relocation Request message, RANAP control unit 105 receives: comparing the Relocation Request message information and information registered in the database 104, Cell femtocell 9 HNB6 is constructed as a Handover Target Cell identify Identity, selects the GW2 that HNB6 is connected as a destination of the message (operation S37).

Subsequently, the control unit 105 sets the Cell Identity of the femtocell 9 as Target Cell Identity, RANAP and the address of GW2 as a destination: sending a Relocation Request message from the lower communication part 102 (operation S38). The RANAP: control unit 205 of the GW2 that receives the Relocation Request message, it is understood that the hand-procedure from Target Cell Identity of the message to the femtocell 9 HNB6.

3.4) in the handover destination OF 14, GW1 is, RANAP from the core network 15 by the communication unit 101: Upon receiving the Relocation Request message (operation S310), the control unit 105 is Target Cell Identity contained in the received message whether to confirm contained in HNB registration table of the database 104 (operation S311). If not included (operation S311; NO), the control unit 105 further Measurement Report to confirm whether it is set correctly (operation S312). For example Intra-Frequency Measurement Event 1a, 1c, or two or more OTD (Observed Time Difference) information an event information indicating a handover destination for the cell corresponding to the Target PSC set to Event the Result like 1e is set to see how.

If Measurement Report is properly set (operation S312; YES), the control unit 105, RANAP: performing filtering using the cell information and the time difference table in the database 104 by the various information set in the Relocation Request message (operation S313). This filtering process will be described later.

Subsequently, the control unit 105 checks the number of records remaining after filtering (candidate number) (Operation S314), the number of candidates is 1, then select the Cell Identity of the femto cell corresponding to the candidate (operation S315 ). If the number of candidates is 2 or more, RANAP: a Relocation Request delta_OTD calculated from OTD information included in Measured the Result message, the remaining additional information of the candidate delta_OTD (other-f), i.e. the OTD for other cells by comparing the difference, between the OTD related femtocell selects only one most matching candidates to identify the cell Identity of the femtocell (operation S316). Since a neighboring cell information excluding any delta_OTD information to the target cell and a macro cell can identify the femtocell with a high probability the more neighbor cell information delta_OTD information matches. A specific example of how to calculate the delta_OTD from OTD information contained in Measured the Result will be described later.

Thus, when Cell Identity femtocell by the operation S315 and S316 are determined, the control unit 105 RANAP a Cell Identity determined: Set Target Cell Identity of Relocation Request message, corresponding to the Cell Identity from HNB registration table It obtains the address of the HNB / GW to be set as a destination. Thus, RANAP: a Relocation Request message can be sent to the HNB6 femtocell 9, it is possible to perform a handover to the femtocell 9 (operation S317).

If the Measurement Report is not set correctly (operation S312; NO) if or the number of candidates in the operation S314 is 0, the control unit 105 determines that the handover failure, RANAP: sends a Relocation Failure to core network 15 It rejects the handover Te (operation S318). Further, the received RANAP: If Target Cell Identity contained in the Relocation Request message if included in the HNB registration table of the database 104 (operation S311: YES), as a unique cell Target Cell Identity is already RNC14 or core network 15 It was determined to be specific, toward the address of the corresponding HNB / GW to the Cell Identity acquired from HNB registration table RANAP: sending a Relocation Request message (operation S319).

<Method of calculating the delta_OTD>
Specific examples of the method of calculating the delta_OTD from Measured Results in operation S316 described above are shown below. Note that this calculation method, (see operation S336 of FIG. 15 described later) which is also used in the filtering process in operation S313.

OTD is the difference between the RLC Transparent Mode Count-C with SFN and the reference time of the UE of P-CCPCH which is a reference time of the cell, IE COUNT-C-SFN high, consists OFF and Tm. OTD information in PSC and a set of each cell measured by UE, included in Measured the Result of Measurement Report sent from the UE. PSC macrocell 13 is commonly included in the Measured the Result of Measurement Report calculation, the PSC of the femtocell 9 included in the Event the Result of Measurement Report, OTD_macro, OTD_femto, the delta OTD (mf) is the following formula It is.

OTD_macro = (COUNT-C-SFN high (macro) * 256 + OFF (macro)) * 38400 + Tm (macro)
OTD_femto = (COUNT-C-SFN high (femto) * 256 + OFF (femto)) * 38400 + Tm (femto)
delta_OTD (mf) = [(OTD_macro - OTD_femto) + 4096 * 38400] mod (4096 * 38400)

Incidentally, based on the definition of 3GPP TS25.215 version 11.0.0 Physical layer-Measurements (FDD) (Release 11), it may be calculated as follows.
OTD_macro = OFF (macro) * 38400 + Tm (macro)
OTD_femto = OFF (femto) * 38400 + Tm (femto)
delta_OTD (mf) = [(OTD_macro - OTD_femto) + 256 * 38400] mod (256 * 38400)

<Filtering process S313>
Hereinafter, the filtering process using the cell information and time difference table illustrated in FIG. 7 (operation in FIG. 14 S313), will be described with reference to FIG. 15. Hereinafter, the filtering key femtocell PSC, macro cell ID, a virtual cell ID, and will be described filtering processing procedure using a set of PSC and Delta_OTD, application order of these filtering key is optional, in FIG. 15 the processing order shown as an example.

15, the process of the PSC of the femtocell filtering key is as follows. Cell information and the time difference table RANAP: Relocation Request leaving only candidates that meet the PSC of Event the Result contained in the message (operation S330).

Processing of the macro cell ID and the filtering key is as follows. UTRAN Cell Identity is confirmed whether it is set to the first entry of the UE History Information (operation S331). If UTRAN Cell Identity that are configured as first entry UE History Information (operation S331; YES), a macro cell identity of the cell information and the time difference table RANAP: the first entry of the UE History Information contained in the Relocation Request message leaving only candidates that match the set cell identification information (operation S332).

Processing of the virtual cell identification information filtering key is as follows. One of the virtual cell identification information in the cell information and the time difference table, RANAP: Relocation Request left only candidates that meet the target cell identification information (Target Cell Identity) contained in the message (S333). Subsequently, the control unit 105 determines whether at least one candidate remains in the cell information and time difference table (operation S334). If the candidate does not remain; return to (operation S334 NO), before executing the filtering process operation S333 state (operation S335). If remaining candidate (Operation S334; YES), it proceeds to the next step.

Processing to set the filtering key of the PSC and the delta_OTD is as follows. First, the control unit 105 RANAP received: calculating a delta_OTD from Measured Results of Relocation Request message (operation S336). Calculation of delta_OTD are as described above. Subsequently, the cell information and the time difference table {macrocell PSC, delta_OTD (mf)} was obtained from Measured the Results {PSC, calculated delta_OTD (mf)} and left only candidates that match (operation S337). Incidentally, as already mentioned, in comparison Delta_OTD, considering may deviate several chips by drift radio wave propagation distance and long reference signal of the cell by the operation, the value of Delta_OTD for the same or any determination it is also possible to have a width. For example, the width for Delta_OTD 1000, when Delta_OTD value is 10000, the value of Delta_OTD 9000 to 11000 may determine the cell with the information of the same Delta_OTD.

3.5) Hand-out phase will be briefly described the operation when the UE16 residing in femtocell 9 is handout to the macrocell 13. However, if it contains the macro cell ID in Neighbor Information in HNB registration phase, as described above, the cell information acquisition is not necessary for the following hand-out phase. Even when not included macrocell ID, cell identified by the filtering process shown in FIG. 15 is possible.

16, the control unit 105 of GW1, RANAP from the lower device: receiving the Relocation Required message (operation S401), the sender determines whether the GW 2 (operation S402). Whether sender GW or HNB, can be grasped from the source address, SCTP (Stream Control Transmission Protocol) Link information, the lower layer information. If the sender is a GW 2 (operation S402; YES), UE History Information determines whether UTRAN Cell Identity is set to (operation S403). If it sets (operation S403; YES), searches for PSC information corresponding the HNB registration table on Cell Identity of UE History Information (operation S404).

Subsequently, RANAP: Relocation Required measurement report in the message determines whether (Measurement Report) are set correctly (operation S405). Specifically, the same as the determination method described in operation S312 of FIG. 14. If Measurement Report is properly set (operation S405; YES), RANAP: Relocation target cell identification information or the set in Required message RANAP: macro coverage Surrounding HNB / GW which is the source of the Relocation Required message cell identification information of the information determines whether included in the virtual cell ID table (operation S406). If it included (operation S406; YES), obtaining at least one virtual cell identification information corresponding to the cell identification information of the target cell identification information or macro coverage information from the virtual cell ID table (operation S407).

If cell identification information of the macro coverage information Surrounding the operation S407 is the case to obtain a list of virtual cell identification information or the target cell identification information or the source HNB / GW it is not included in the virtual cell ID table (operation S406 ; NO), the control unit 105, the received RANAP: calculating a delta_OTD from measurement reports Relocation Required message (operation S408). Specific examples of the calculation method is as described above.

Thus, the control unit 105 in the cell information and the time difference table of the database 104, cell identification information and PSC of HNB, virtual cell ID list, cell identification information and PSC macrocells, Delta_OTD between macrocells and femtocells and the Measured Results a list of delta_OTD the PSC and the other cell and the femto cell other cells contained storing (operation S409). Hereinafter, it executes the remaining normal handout procedure (operation S410).

3.6) Effects As described above, according to the first embodiment of the present invention, GW2 by using a HNB registration / update message and notifies the cell information about the cell 7-9 subordinate to GW2 to GW1 higher , GW1 to build a database of cell information using this. If UE 16 NodeB12 to in radio connection of the macrocell 13 to hand in to the femto cell 9 under GW2 from macrocell 13, GW1 receives the handover request from the RNC 14, by referring to the cell information registered in the database , target cell of the handover can be known to be a femtocell 9 under GW 2, it may send a handover request to HNB6 through GW 2.

More specifically, since GW2 is transmitting cell identification information and PSC information HNB to GW1, GW1 can be stored in that cell identification information and PSC information for HNB is information under GW2. Accordingly, GW1 in hand-in with identifiable target cell, it is possible to determine the destination of the handover request message, it becomes possible to maintain without wireless communication connection to be dropped in the movement of the UE 16.

The database of the GW1, the address information of the HNB / GW under for holding the HNB registration table with cell identification information, target cell identification information of the handover request message in hand-phase correctly identify the target cell If you are able to, without using a cell information and time difference table, it is possible to uniquely determine the destination address of the handover request message from the database.

Furthermore, the database of the GW1, because it holds the virtual cell identification information corresponding to the macro cell identification information as a virtual cell ID table, the hand-phase, filtering the cell information and the time difference table by the target cell identification information of the handover request message becomes possible, it is possible to increase the probability of identifying a target cell.

Furthermore, since the message GW2 sends to GW1 includes delta_OTD information between the femtocell and the macrocell can GW1 to build cell information and time difference table, the hand-phase, that GW1 identifies the target cell It can become.

Also, a message GW2 sends to the GW1, addition of the femtocell, degrowth or Cell Identity change, PSC changes, changes in neighboring macrocells, each time it detects a change in delta_OTD the femto cell and macro cell, is updated it is possible to transmit the information. Therefore, it is possible GW1 to build the latest cell information and time difference table.

Also, GW 2, taking into account the change in delta_OTD the femto cell and macro cell, GW 2 only if it exceeds a predetermined threshold value to send a message to the GW1, is provided with a mechanism called. Thus, GW1 is in building the latest cell information and time difference table, there is no need to frequently send update messages, it contributes to the reduction of the network load.

Further, even when the GW1 is determined as the same cell from the information of the cell information and the time difference table, since the determination that the same cell if it is within a certain threshold, some fluctuation of delta_OTD the femtocell and the macrocell even it is possible to specify the target cell.

Further, the femtocell identification information of HNB, HNB is easier administration by Address information and cell information · GW1 time difference table GW2 connecting, before hand-phase as described in Non-Patent Documents 1 and 2 hand-out phase is not required.

4. According to the second embodiment of the second embodiment the present invention, the database information of GW1, the terminal UE16 is constructed by using a handover request message when handouts from femtocell 9 to the macrocell 13. Hereinafter, with reference to FIGS. 17 and 18, will be described registration / update operation of cell information in the hand-out phase.

The registration / update operation FIGS. 17 and 18 of 4.1) cell information while UE16 is HNB6 and wireless connection femtocell within 9, PSC the PSC Cell9 from the pilot signal of the femtocell 9, from the pilot signal of the macrocell 13 the Cell13, receiving, respectively. Based on the measurement results, such as towards the pilot received power of the macro cell 13 is greater than the pilot reception power of the femtocell 9 sends a measurement report through HNB6 to GW2 (Measurement Report) (Operation S40).

The Measurement Report, contains the Event the Result (event results) Measured the Result (measurement result), the Event the Result is set PSC Cell13 macrocell 13, the Measured the Result, information about the macro cell 13 (PSC Cell13, a reference time difference OTD Cell13 time) between the UE 16 and the macro cell 13, and information (PSC Cell9, UE16 and time difference OTD Cell9 reference time with Mafemutoseru 9) regarding the femtocell 9, is set. A time difference OTD to be handled here includes a femtocell 9 and the primary CCPCH (Common Control Physical Channel) of a physical channel of the macrocell 13 SFN (System Frame Number), and Frame Offset of the RLC Transparent Mode of COUNT-C of the UE16 a Chip Offset. 3GPP TS25.331 V11.4.0 (2013-1) Radio Resource Control (RRC); the Protocol specification (Release 11), the OTD is represented by three parameters of COUNT-C-SFN high, OFF and Tm.

Upon receipt of the Measurement Report message, GW 2 is, 3GPP TS 25.413 V11.2.0 (2012-12) UTRAN Iu interface Radio Access Network Application Part (RANAP) signalling as described in (Release 11) RANAP: Relocation Required (handover request) to construct a message to the GW1 (operation S41). The Relocation Required message,
1) Target ID (target identification information)
2) Target Cell Identity (target cell identity)
3) UE History Information (terminal history information)
4) Source RNC to Target RNC Transparent Container (source - target RNC between the transparent container)
There is set. Here, the identification information of RNC14 the Target ID is the Target Cell Identity cell identification information of the macro cell 13 are respectively set. Furthermore, the UE History Information, UE 16 as IE Cell Identity is a combination of identification information and PSC of the femtocell 9 were visited is set.

RANAP: Upon receiving the Relocation Required (handover request) message, GW1 RANAP was the received: Relocation Request from the contents of the message to build HNB registration table and cell information and the time difference table of the database 104 (operation S42). Furthermore, GW1 is the core network 15 RANAP: sending a Relocation Required message (operation S43). RANAP in the operation S43: RANAP in Relocation Required configuration message operation S41: The Relocation Required message, which is identical except for the following points.

That, RANAP in operation S41: Relocation Required message before the handover cell contained in PSC information (where PSC Cell9 is) is deleted, RANAP in operation S43: The UE History Information of Relocation Required message, the IE Cell Identity UE 16 is cell identification information of the serving the cell (Cell9 here), IE UE stayed in cell historical cell dwell time of UE 16 (in this case, time Cell9) is set for the number of each serving the cell .

RNC14 is, RANAP through the core network 15 from GW1: Upon receiving the Relocation Request message, thereafter, normal handover processing is performed. Incidentally, the GW1 to RNS14, without passing through the core network 15 may be directly in the handover request message is sent.

<Registration of cell information>
As shown in FIG. 19, the registration procedure of the cell information in the second embodiment is the same as the procedure excluding the operation S305 and S306 from the procedure of registration the first embodiment shown in FIG. 12 (operation S301 ~ S308).

That is, in FIG. 19, if the HNB to HNB registered with a single femtocell (operation S303; NO), the control unit 105, the base station of Cell Identity, the database 104 a combination of PSC and Address of HNB It is registered in the registration table (operation S304). If HNB registration is the case has been completed or registration operation S304 is GW2 having a plurality of femto cells (operation S303; YES), the control unit 105 is adjacent to the HNB / GW to HNB REGISTER REQUEST message received macrocell It is equal to or is set (operation S307). HNB REGISTER REQUEST message to the Local Cell Information of whether is included determination (operation S305) and HNB Registration registration table (operation S306) is not executed.

<Cell information registered at the time of hand-out>
As shown in FIG. 20, hand-out procedures in the second embodiment, only the operation S404 of handouts procedure of the first embodiment shown in FIG. 16 (operation S401 ~ S410) are different.

In FIG. 20, the control unit 105 of GW1, RANAP from the lower device: receiving the Relocation Required message (operation S401), the sender determines whether the GW 2 (operation S402). Whether sender GW or HNB, can be grasped from the source address, SCTP (Stream Control Transmission Protocol) Link information, the lower layer information. If the sender is a GW 2 (operation S402; YES), UE History Information determines whether UTRAN Cell Identity is set to (operation S403). If set (operation S403; YES), stores the address information of the cell identification information and PSC and GW2 of HNB to HNB registration table of the database 104 (operation S404a).

Subsequently, RANAP: Relocation Required measurement report in the message determines whether (Measurement Report) are set correctly (operation S405). Specifically, the same as the determination method described in operation S312 of FIG. 14. If Measurement Report is properly set (operation S405; YES), RANAP: Relocation target cell identification information or the set in Required message RANAP: macro coverage Surrounding HNB / GW which is the source of the Relocation Required message cell identification information of the information determines whether included in the virtual cell ID table (operation S406). If it included (operation S406; YES), obtaining at least one virtual cell identification information corresponding to the cell identification information of the target cell identification information or macro coverage information from the virtual cell ID table (operation S407).

If cell identification information of the macro coverage information Surrounding the operation S407 is the case to obtain a list of virtual cell identification information or the target cell identification information or the source HNB / GW it is not included in the virtual cell ID table (operation S406 ; NO), the control unit 105, the received RANAP: calculating a delta_OTD from measurement reports Relocation Required message (operation S408). Specific examples of the calculation method is as described above.

Thus, the control unit 105 in the cell information and the time difference table of the database 104, cell identification information and PSC of HNB, virtual cell ID list, cell identification information and PSC macrocells, Delta_OTD between macrocells and femtocells and the Measured Results a list of delta_OTD the PSC and the other cell and the femto cell other cells contained storing (operation S409). Hereinafter, it executes the remaining normal handout procedure (operation S410).

4.2) hand-in phase of the database 104 as described above HNB registration table, a virtual cell ID table and cell information and the time difference table is constructed, by using the database information, as in the first embodiment, FIG. hand-procedure described in 13 and 14 may be performed.

4.3) Effects As described above, according to the second embodiment of the present invention, it is possible to obtain the following effects.
First, by using the handover request message to be notified to the GW1 from GW2, it notifies the cell information about the cell 7-9 subordinate to GW2 to GW1 higher, GW1 to build a database of cell information using this. If UE 16 NodeB12 to in radio connection of the macrocell 13 to hand in to the femto cell 9 under GW2 from macrocell 13, GW1 receives the handover request from the RNC 14, by referring to the cell information registered in the database , target cell of the handover can be known to be a femtocell 9 under GW 2, it may send a handover request to HNB6 through GW 2.

More specifically, since GW2 is transmitting cell identification information and PSC information HNB to GW1, GW1 can be stored in that cell identification information and PSC information for HNB is information under GW2. Accordingly, the GW1 can identify a target cell in hand-it is possible to determine the destination of the handover request message may be maintained without it expires and wireless communication connection in a mobile of the UE 16.

Further, RANAP is transmitted from the GW2 to GW1 in the hand-out phase: in the IE Cell Identity and Time UE Stayed In Cell IE in UE History Information of Relocation Required message, in addition to the cell identification information and PSC information HNB, existing also set the IE Cell Identity and Time UE Stayed in Cell IE. Furthermore, GW1 is RANAP transmits to RNC 14: The Relocation Required IE Cell Identity and Time in UE History Information in the message UE Stayed In Cell IE, sets only existing IE Cell Identity and Time UE Stayed In Cell IE. Therefore, it is not necessary to add a new parameter to the handover request message sent from GW1 to RNC 14, handover during handout as usual in the core network 15 and RNC 14 request message settings are available.

The database of the GW1, the address information of the HNB / GW under for holding the HNB registration table with cell identification information, target cell identification information of the handover request message in hand-phase correctly identify the target cell If you are able to, without using a cell information and time difference table, it is possible to uniquely determine the destination address of the handover request message from the database.

GW1, since holding the virtual cell ID table corresponding to the identification information of the macro cell to the internal database 104, the hand-out phase, corresponding to the macro cell or HNB / GW 2 neighboring macrocells as the target cell to the cell information and the time difference table virtual cell ID list can also be stored. Thus, in the hand-in phase, it is possible to filter the cell information and the time difference table by the target cell identity of RANAP Relocation Request message, it is possible to increase the probability of identifying a target cell.

GW1, in HNB registration procedure HNB / GW 2, since automatically build an internal database 104 a combination of a HNB / GW 2 of the address information with the cell identification information and the cell identification information, the hand-phase, RANAP Relocation If the target cell identification information of the Request message is able to identify the correct target cell, it is possible to determine the destination address of the RANAP Relocation Request message from the database 104.

GW1, in hand-out phase, RANAP: a cell identification information HNB from UE History Information of Relocation Required message, RANAP: the combination of the GW2 address information which is the source of the Relocation Required message automatically in the internal database 104 because building, in hand-phase, when the target cell identification information of the RANAP Relocation Request message is able to identify the correct target cell, it is possible to determine the destination address of the RANAP Relocation Request message from the database 104 .

Further, in the cell information · Delta_OTD information time difference table GW1, since provided the width in determining the same, cause deviation of the OTD due to propagation distance difference due to the handover point in the cell, as a result, Delta_OTD information also even misalignment occurs can GW1 determines that same cell, it is possible to increase the specific probability of the target cell. Also, some deviation in transmission timing of the reference signal of a cell after a long-term operation of the cell as occurs, the same effect can be obtained.

5. As a method of a combination of the cell identity and PSC other embodiments HNB GW1 know, how to use the HNB registration / update message as in the first embodiment described above, UE History as in the second embodiment a method using a IE Time UE Stayed in Cell of Information, but it is also possible that the network architecture or access method employing other methods. Hereinafter, another embodiment will be described.

5.1) According to the third embodiment of the third embodiment the present invention, to set a combination of one Cell Identity and PSC to UE History Information.

In handout sequence shown in Figure 18, the operation S41 RANAP: The Relocation Required message, the combination of IE UE History Information on Cell Identity and Time UE Stayed in Cell can be multiple sets. In the second embodiment described above, in addition to the information of the original set of UE History Information, it is set by adding a combination of Time UE Stayed in Cell IE to HNB the PSC and the cell identification information.

In contrast, to set only one only the combination of the cell identity and PSC of HNB, a method can also be called. In this case, in operation S43 in FIG. 18, not set the IE UE History Information in RANAP Relocation Required message to GW1 sends to the core network 15.

According to the third embodiment, since GW2 is transmitting cell identification information and PSC information HNB to GW1, GW1 can be stored in that cell identification information and PSC information for HNB is information under GW2. Accordingly, the GW1 can identify a target cell in hand-it is possible to determine the destination of the handover request message may be maintained without it expires and wireless communication connection in a mobile of the UE 16.

Further, RANAP is transmitted from the GW2 to GW1 in the hand-out phase: in the IE Cell Identity and Time UE Stayed In Cell IE in UE History Information of Relocation Required message, in addition to the cell identification information and PSC information HNB, existing also set the IE Cell Identity and Time UE Stayed in Cell IE. Furthermore, GW1 is RANAP transmits to RNC 14: The Relocation Required IE Cell Identity and Time in UE History Information in the message UE Stayed In Cell IE, sets only existing IE Cell Identity and Time UE Stayed In Cell IE. This eliminates the need to add a new parameter to the handover request message sent from GW1 to RNC 14, handover during handout as usual in the core network 15 and RNC 14 request message settings are available.

5.2) According to the fourth embodiment of the fourth embodiment the present invention, as the cell of measurement information to be included in the Measured the Result, sets only two cells of the source cell and the target cell.

According to the fourth embodiment, in the hand-out phase, only the PSC and OTD information PSC and OTD information and the target cell of the source cell to the Measured the Result of Measurement Report of RANAP Relocation Required message described in operation S41 in FIG. 18 set to. In this case, IE UE History Information, the operation can be set on only the information of the UE History Information of existing setting, the IE UE History Information of RANAP Relocation Required message to GW1 sends to the core network 15 in operation S43 in FIG. 18 the same value as that set in S41 can be set.

Further, since the PSC set in Measurement Report of Event the Result of RANAP Relocation Required message is a PSC of the target cell, PSC associated with the first Cell Identity of UE History Information is the Measurement Report of the RANAP Relocation Required message not a PSC is set to Event Result, which is another one of the PSC.

In this way, we obtain the mapping between the cell identification information of a cell PSC and HNB of HNB the source cell, together with the stores to HNB registration table, be utilized as information for creating cell information and time difference table it can.

According to the fourth embodiment of the present invention, since GW2 is transmitting cell identification information and PSC information HNB to GW1, GW1 is, that the cell identification information and PSC information for HNB is information under GW2 It can be stored. Accordingly, the GW1 can identify a target cell in hand-it is possible to determine the destination of the handover request message may be maintained without it expires and wireless communication connection in a mobile of the UE 16.

The database of GW1 holds the address information of the HNB / GW under with cell identification information as a HNB registration table. Therefore, when the target cell identification information of the handover request message in hand-phase is able to identify the correct target cell, without using the cell information and time difference table, a destination address uniquely handover request message it can be determined from the database.

GW1, in HNB registration procedure HNB / GW 2, automatically build an internal database 104 a combination of a HNB / GW 2 of the address information with the cell identification information and the cell identification information. Thus, the hand-phase, when the target cell identification information of the RANAP Relocation Request message is able to identify the correct target cell, it is possible to determine the destination address of the RANAP Relocation Request message from the database 104.

GW1, in hand-out phase, RANAP: a cell identification information HNB from UE History Information of Relocation Required message, RANAP: the combination of the GW2 address information which is the source of the Relocation Required message automatically in the internal database 104 To construct. Thus, the hand-phase, when the target cell identification information of the RANAP Relocation Request message is able to identify the correct target cell, it is possible to determine the destination address of the RANAP Relocation Request message from the database 104.

5.3) According to the fifth embodiment of the fifth embodiment the present invention, the relationship between the plurality of HNB housed the accommodating to the GW2, as one or more cells one cell belonging to GW2 taking the GW1 if the managed, it may have the following form.

a) GW and the HNB is a multi-stage constructed HNB system. Can be utilized in corporate GW, etc., a plurality of GW may be present in the middle as a configuration.
b) wireless network system constituted by RNC and a plurality of NodeB connected under GW.
Relay system consisting of c) Donor base station and Relay base station. Donor base station performs one or a plurality of Relay base station and a wired or wireless connection may be constructed even cell Donor base station.
d) C / U separation base station system. C-Plane control is aggregated in one typical system, Radio Point of U-Plane is more present.
Be a system configuration of the above-mentioned a) ~ d), the present invention is applicable.

5.4) In the first to fifth embodiments described above sixth embodiment describes WCDMA technology as a base but, LTE (Long Term Evolution) or GSM, even WiFi like other wireless systems applicable it is.

For example, in LTE HeNBGW and HeNB and is one of the femto base station system, is connected to the 2HeNBGW the corporate network to the 1HeNBGW operator network, HeNB is connected to a plurality of further under the. Also in this configuration, the 1HeNBGW the physical cell identity of the cell under the control of the 2HeNBGW: managing a combination of (PCI Physical Cell Identity) and the logic cell identity (Cell Identity), and macro eNB and HeNB It can be applied to the Hand-in / out operation using the Delta_OTD.

5.5) In the second embodiment described above seventh embodiment, utilizing the Intra Frequency Measurement of such Event 1a and Event 1c as cell measurements for UE, it can also be utilized and Inter Frequency Measurement, the OTDOA Measurement. For inter-frequency handover, cell HNB may exist as a beacon cell for notifying only the system information of the HNB cells even at different frequency. It is also conceivable to use only the value of Tm as delta_OTD information.

According to the eighth embodiment of 5.6) Eighth embodiment the present invention, GW1, RNC 14, to build the cell information and time difference table by the inter-device communication HNB.

In the first to seventh embodiments described above, the cell information and the time difference table has been constructed from the information set in the message, GW1, RNC 14, because the HNB and GW2 holds the reference time, respectively, direct device it is possible to recognize the difference of timing by between communication. By also giving information on the reference time of each cell between the device communication, it is possible to construct the cell information and the time difference table GW1.

5.7) According to the ninth embodiment of the ninth embodiment the present invention, to construct a cell information and time difference table as system parameters GW1.

In the first to eighth embodiments described above, the cell information and the time difference table and HNB registration table, but GW1 was intended to build itself from the transceiver or device synchronizing function of the device between messages, according to the ninth embodiment if, it is also possible to set the information through the external interface. For example Well be input manually, the other nodes to gather information of the second relay device, if there is the test terminals, such as collect or field network information including a second relay device, Ya the test terminal it may be sending the information from the other node to the first relay device.

5.8) According to the tenth embodiment of the tenth embodiment the present invention is constructed respectively in the cell information and time difference table GW1 and GW 2.

In the first to ninth embodiments described above, the cell information and the time difference table has been built as a database 104 GW1 holds, you are possible to provide a similar mechanism to GW 2.

In embodiments and examples described above, the above-mentioned base station, the processing of the relay device, each may be performed by a logic circuit manufactured in accordance with the purpose. Further, it recorded in each readable recording medium storing a program describing the processing contents as a procedure at the base station and the relay apparatus, to read each program recorded on the recording medium to the base station and the relay apparatus, which executes it may be. A recording medium readable by the base station or a relay device, a floppy disk (registered trademark), a magneto-optical disk, DVD, other relocatable recording medium such as a CD, ROM incorporated respectively in the base station or a relay device refers to the memory and HDD and the like, such as a RAM. The recording medium program recorded on the read respectively by a CPU (not shown) of the base station and the relay device, the control of the CPU, the processing similar to that described above is performed. Here, CPU is one that operates as a computer that executes the program read from a recording medium on which the program is recorded.

6. Some or all of the appended described above embodiment, can be described as the following appendices, but is not limited thereto.

(Note 1)
The base station controller and the first relay device is connected to the communication network, at least one first base station is connected under the base station controller, at least a second relay device connected under the first relay device is, a handover control method in a radio communication system in which at least one second base station is connected under the second relay device,
Wherein the first relay device, acquires cell information of the cell the second base station under the control of the second switching device is controlled,
In hand-in phase of the handover to the second base station radio station from said first base station in a radio connection, the first relay device, using the cell information to identify the target cell of the handover,
Handover control method, characterized in that.
(Note 2)
The cell information, handover control method according to Supplementary Note 1, wherein the containing and logic cell identification information and the physical cell identification information identifying the cell of the second base station of the subordinate.
(Note 3)
Appendixes said first relay device, using a physical cell identity of the target cell contained in the handover request message received from the base station controller and said cell information, and identifies the target cell the handover control method according to 2.
(Note 4)
The cell information further comprising: the physical cell identification information and the second base station uses the neighboring cells of the cell for controlling, and a time difference information of the reference time between the cell and the adjacent cells the handover control method according to Appendix 2 or 3.
(Note 5)
Wherein the first relay device, and the physical cell identification information of the target cell contained in the handover request message received from the base station controller, and time difference information of the reference time between the target cell and the source cell, the cell by using the information, the handover control method according to Supplementary note 4, wherein the identifying the target cell.
(Note 6)
The handover control method according to any one of Appendices 1-5, characterized in that said first relay device to input the cell information from the outside.
(Note 7)
The second relay device, in appendix 6 and notifies the cell information to the first relay device using a base station registration message or the base station update message transmits the information about the second base station subordinate the handover control method as claimed.
(Note 8)
Appendixes said second relay device, using a handover request message of the hand-out phase to handover from the second base station to the first base station, and notifies the cell information to the first relay device the handover control method according to 6.
(Note 9)
Handover request message of the hand-out phase, handover the physical cell identity of the source cell of the handover information element relating to the history information of the wireless station is set, is transmitted from the first relay apparatus to the base station controller request message, a handover control method according to Supplementary note 8, wherein the normal residence time information in the information element related to the history information of the wireless station is set.
(Note 10)
Wherein the first relay device, and the logic cell identification information about the cell and the cell of the second base station of the base station immediately below the base station immediately below the, the address information of the second base station and the second relay device holding the base station registration table that associates,
Wherein searching a base station registration table, to identify the destination address of the target cell and the handover request message using the logic cell identification information of the target cell of the handover request message received from the base station controller,
The handover control method according to any one of Appendices 1-9, characterized in that.
(Note 11)
Wherein the first relay device, wherein the logic cell identification information of the cell of the first base station, wherein at least one of the logic cell identification information of at least one virtual cell including a second base station, the cell of the first base station holds cell information table that associates a logical cell identification information of the cell of the second base station and an adjacent,
It searches the cell information table using the logical cell identification information of the target cell of the handover request message received from the base station controller, Filter candidate of the target cell,
The handover control method according to any one of Appendices 1-10, characterized in that.
(Note 12)
The cell information table further, the physical cell identification information neighbor cell of the cell of the second base station uses the physical cell identity cell of the second base station uses adjacent to cells of the first base station When, wherein the time difference information of the reference time between the second base station of the cell and its adjacent cells,
A physical cell identity of the target cell of the handover request message, by searching the cell information table by using the time difference information of the reference time between the target cell and the source cell, further candidates of the target cell refine,
The handover control method of statement 11, wherein the.
(Supplementary Note 13)
The cell information table further, the physical cell identification information other cells except for the cell and the cell of the first base station of the second base station uses the other cell and the second cell of the base station wherein the time difference information of the reference time between,
A physical cell identity of the target cell of the handover request message, by searching the cell information table by using the time difference information of the reference time between the target cell and the source cell, further candidates of the target cell refine,
The handover control method according to Supplementary Note 11 or 12, characterized in that.
(Note 14)
It said first relay and said second relay device, any one of Appendices 4,5,12 and 13, characterized in that setting the width for determining the time difference information of the reference time between cells and the same the handover control method according to.
(Note 15)
Wherein the first relay device, using the cell information, handover control method according to any one of Appendices 1-14, characterized in that to identify the route to the target cell of the handover.
(Supplementary Note 16)
The base station controller is connected to a connected communication network, a relay apparatus in which at least lower relay device is connected under at least one of the first base station is connected under the base station control device, wherein At least one of the second base station is connected under the lower relay device,
Storage means for storing the cell information of the cell the second base station subordinate to the lower relay device controls,
In hand-in phase of the handover to the second base station radio station from said first base station in the radio connection, and control means for using the cell information to identify the target cell of the handover,
Relay apparatus characterized by having a.
(Note 17)
The cell information, the relay device according to note 16, which comprises a, a logical cell identification information and the physical cell identification information identifying the cell of the second base station of the subordinate.
(Note 18)
Wherein said control means uses the physical cell identity and the cell information of the target cell contained in the handover request message received from the base station controller, in appendix 17, characterized in that identifying the target cell relay device as claimed.
(Note 19)
The cell information further comprising: the physical cell identification information and the second base station uses the neighboring cells of the cell for controlling, and a time difference information of the reference time between the cell and the adjacent cells relay device according to note 17 or 18,.
(Note 20)
Wherein said control means includes a physical cell identity of the target cell contained in the handover request message received from the base station controller, and time difference information of the reference time between the target cell and the source cell, and the cell information using relay device according to note 19, wherein the identifying the target cell.
(Supplementary Note 21)
Wherein, the relay apparatus according to any one of Appendices 16-20, characterized in that inputs the cell information from the outside.
(Note 22)
Said control means, wherein from said lower relay device, in appendix 21, characterized in that to receive the cell information using the base station registration message or the base station update message transmits the information about the second base station under its control of the relay device.
(Note 23)
It said control means from said lower relay device, using a hand-out phase of the handover request message to handover from the second base station to the first base station, in appendix 21, characterized in that receiving the cell information relay device as claimed.
(Note 24)
Handover request message of the hand-out phase, the physical cell identity of the source cell of the handover information element relating to the history information of the wireless station is set, the control means, a handover to be transmitted to the base station controller setting said history information information element to the usual residence time for the information of the wireless station request message, the relay device according to note 23, wherein the.
(Note 25)
Said storage means includes a logic cell identification information about the cell and the cell of the second base station of the base station immediately below the relay apparatus, the base station immediately below the, the address information of the second base station and the lower relay device holding the base station registration table that associates,
Wherein said control means uses the logic cell identification information of the target cell of the handover request message received from the base station controller searches the base station registration table, identifies the destination address of the target cell and the handover request message to,
Relay device according to any one of Appendices 16-24, characterized in that.
(Note 26)
Said storage means, adjacent a logic cell identification information of the cell of the first base station, said at least one logic cell identification information of at least one virtual cell including a second base station, a cell of the first base station a logic cell identification information of the cell of the second base station, the cell information table that associates held,
Wherein the control unit searches the cell information table using the logical cell identification information of the target cell of the handover request message received from the base station controller, Filter candidate of the target cell,
Relay device according to any one of Appendices 16-25, characterized in that.
(Note 27)
The cell information table further, the physical cell identification information neighbor cell of the cell of the second base station uses the physical cell identity cell of the second base station uses adjacent to cells of the first base station When, wherein the time difference information of the reference time between the second base station of the cell and its adjacent cells,
The control means, by searching the cell information table by using the physical cell identification information of the target cell of the handover request message, and the time difference information of the reference time between the target cell and the source cell, the target further narrow the candidate of the cell,
Relay device according to note 26, wherein the.
(Note 28)
The cell information table further, the physical cell identification information other cells except for the cell and the cell of the first base station of the second base station uses the other cell and the second cell of the base station wherein the time difference information of the reference time between,
The control means, by searching the cell information table by using the physical cell identification information of the target cell of the handover request message, and the time difference information of the reference time between the target cell and the source cell, the target further narrow the candidate of the cell,
Relay device according to note 26 or 27, characterized in that.
(Note 29)
Relay device according to any one of the control unit note and sets a width for determining the time difference information of the reference time between cells the same 19,20,27 and 28.
(Note 30)
It said control means, by using the cell information, the relay apparatus according to any one of Appendices 16-29, characterized in that to identify the route to the target cell of the handover.
(Note 31)
The base station controller and the first relay device is connected to the communication network, at least one first base station is connected under the base station controller, at least a second relay device connected under the first relay device is, a target cell selection method in the first relay apparatus in a wireless communication system in which at least one second base station is connected under the second relay device,
Storage means stores the cell information of the cell the second base station under the control of the second switching device is controlled,
Control means, in hand-phase handover to the second base station radio station from said first base station in a wireless connection, select a target cell of the handover using the cell information,
Target cell selection method characterized by.
(Supplementary Note 32)
The cell information, target cell selection method according to Note 31, characterized in that it comprises a and a logic cell identification information and the physical cell identification information identifying the cell of the second base station of the subordinate.
(Note 33)
Wherein said control means uses the physical cell identity of the target cell contained in the handover request message received from the base station controller and with said cell information, in appendage 32, wherein identifying the target cell target cell selection method as claimed.
(Supplementary Note 34)
The cell information further comprising: the physical cell identification information and the second base station uses the neighboring cells of the cell for controlling, and a time difference information of the reference time between the cell and the adjacent cells target cell selection method according to Appendix 32 or 33 to.
(Note 35)
Wherein said control means includes a physical cell identity of the target cell contained in the handover request message received from the base station controller, and time difference information of the reference time between the target cell and the source cell, and the cell information using the target cell selection method of statement 34, wherein the identifying the target cell.
(Note 36)
The control means, the target cell selection method according to any one of Appendices 31-35, characterized in that to receive the cell information from the outside.
(Note 37)
From the lower relay device, the target cell selection method of statement 36, wherein the receiving the cell information using the base station registration message or the base station update message transmits the information about the second base station under its control .
(Note 38)
Wherein the lower relay device, using a handover request message of the hand-out phase to handover from the second base station to the first base station, the target cell selection according to appendix 364, characterized in that receiving the cell information Method.
(Note 39)
Handover request message of the hand-out phase, the physical cell identity of the source cell of the handover information element relating to the history information of the wireless station is set, the control means, a handover to be transmitted to the base station controller target cell selection method according to note 38, wherein setting the normal residence time information in the information element related to the history information of the radio station, it is characterized by the request message.
(Note 40)
Said storage means, cells and the the logic cell identification information about the cell of the second base station, the base station immediately below the said second address information of the base station and the second relay device of the base station immediately below the relay device holding the base station registration table which associates the door,
Wherein said control means uses the logic cell identification information of the target cell of the handover request message received from the base station controller searches the base station registration table, identifies the destination address of the target cell and the handover request message to,
Target cell selection method according to any one of Appendices 31-39, characterized in that.
(Supplementary Note 41)
Said storage means, adjacent a logic cell identification information of the cell of the first base station, said at least one logic cell identification information of at least one virtual cell including a second base station, a cell of the first base station a logic cell identification information of the cell of the second base station, the cell information table that associates held,
Wherein the control unit searches the cell information table using the logical cell identification information of the target cell of the handover request message received from the base station controller, Filter candidate of the target cell,
Target cell selection method according to any one of Appendices 31-40, characterized in that.
(Note 42)
The cell information table further, the physical cell identification information neighbor cell of the cell of the second base station uses the physical cell identity cell of the second base station uses adjacent to cells of the first base station When, wherein the time difference information of the reference time between the second base station of the cell and its adjacent cells,
The control means, by searching the cell information table by using the physical cell identification information of the target cell of the handover request message, and the time difference information of the reference time between the target cell and the source cell, the target further narrow the candidate of the cell,
Target cell selection method of statement 41, wherein the.
(Note 43)
The cell information table further, the physical cell identification information other cells except for the cell and the cell of the first base station of the second base station uses the other cell and the second cell of the base station wherein the time difference information of the reference time between,
The control means, by searching the cell information table by using the physical cell identification information of the target cell of the handover request message, and the time difference information of the reference time between the target cell and the source cell, the target further narrow the candidate of the cell,
Target cell selection method according to Appendix 41 or 42, characterized in that.
(Supplementary Note 44)
It said control means target cell selection method according to any one of Appendices 34,35,42 and 43 and sets the width for determining the time difference information of the reference time between cells and the same.
(Note 45)
It said control means, by using the cell information, the relay apparatus according to any one of Appendices 31-44, characterized in that to identify the route to the target cell of the handover.
(Note 46)
The base station controller and the first relay device is connected to the communication network, at least one first base station is connected under the base station controller, at least a second relay device connected under the first relay device It is, at least one second base station is a connected wireless communication system under the second relay device,
Wherein the first relay device, acquires cell information of the cell the second base station under the control of the second switching device is controlled,
In hand-in phase of the handover to the second base station radio station from said first base station in a radio connection, the first relay device, using the cell information to identify the target cell of the handover,
Wireless communication system, characterized in that.

The present invention is applicable to handover control in a mobile communication system having a cell structure.

1 the first relay device (GW)
2 the second relay device (GW)
3 virtual cell 4-6 base station (HNB)
7-9 cell (femtocell)
10 base stations (HNB)
11 cell (femtocell)
12 base stations (NodeB)
13 cell (macro cell)
14 base station controller (RNC)
15 core network 101 communication unit 102 lower communication part 103 protocol message construction unit 104 database 105 the control unit 201 high-level equipment communication unit 202 base station communication unit 203 protocol message construction unit 204 under the base station information storage unit 205 control unit

Claims (32)

  1. The base station controller and the first relay device is connected to the communication network, at least one first base station is connected under the base station controller, at least a second relay device connected under the first relay device is, a handover control method in a radio communication system in which at least one second base station is connected under the second relay device,
    Wherein the first relay device, acquires cell information of the cell the second base station under the control of the second switching device is controlled,
    In hand-in phase of the handover to the second base station radio station from said first base station in a radio connection, the first relay device, using the cell information to identify the target cell of the handover,
    Handover control method, characterized in that.
  2. The cell information, handover control method according to claim 1, characterized in that it comprises a logic cell identification information and the physical cell identification information identifying the cell of the second base station of the subordinate.
  3. Wherein said first relay device, using a physical cell identity of the target cell contained in the handover request message received from the base station controller and said cell information, and identifies the target cell the handover control method according to claim 2.
  4. The cell information further comprising: the physical cell identification information and the second base station uses the neighboring cells of the cell for controlling, and a time difference information of the reference time between the cell and the adjacent cells the handover control method according to claim 2 or 3,.
  5. Wherein the first relay device, and the physical cell identification information of the target cell contained in the handover request message received from the base station controller, and time difference information of the reference time between the target cell and the source cell, the cell by using the information, the handover control method according to claim 4, characterized in that identifying the target cell.
  6. The handover control method according to any one of claims 1-5, characterized in that said first relay device to input the cell information from the outside.
  7. Claim 6, wherein the second relay device, characterized by notifying said cell information to the first relay device using a base station registration message or the base station update message transmits the information about the second base station subordinate the handover control method according to.
  8. Wherein said second relay device, using a handover request message of the hand-out phase to handover from the second base station to the first base station, and notifies the cell information to the first relay device the handover control method according to claim 6.
  9. Handover request message of the hand-out phase, handover the physical cell identity of the source cell of the handover information element relating to the history information of the wireless station is set, is transmitted from the first relay apparatus to the base station controller request message, a handover control method according to claim 8, wherein the normal residence time information on the information on the history information elements of the radio station is set.
  10. Wherein the first relay device, and the logic cell identification information about the cell and the cell of the second base station of the base station immediately below the base station immediately below the, the address information of the second base station and the second relay device holding the base station registration table that associates,
    Wherein searching a base station registration table, to identify the destination address of the target cell and the handover request message using the logic cell identification information of the target cell of the handover request message received from the base station controller,
    The handover control method according to any one of claims 1-9, characterized in that.
  11. Wherein the first relay device, wherein the logic cell identification information of the cell of the first base station, wherein at least one of the logic cell identification information of at least one virtual cell including a second base station, the cell of the first base station holds cell information table that associates a logical cell identification information of the cell of the second base station and an adjacent,
    It searches the cell information table using the logical cell identification information of the target cell of the handover request message received from the base station controller, Filter candidate of the target cell,
    The handover control method according to any one of claims 1-10, characterized in that.
  12. The cell information table further, the physical cell identification information neighbor cell of the cell of the second base station uses the physical cell identity cell of the second base station uses adjacent to cells of the first base station When, wherein the time difference information of the reference time between the second base station of the cell and its adjacent cells,
    A physical cell identity of the target cell of the handover request message, by searching the cell information table by using the time difference information of the reference time between the target cell and the source cell, further candidates of the target cell refine,
    The handover control method according to claim 11, characterized in that.
  13. The cell information table further, the physical cell identification information other cells except for the cell and the cell of the first base station of the second base station uses the other cell and the second cell of the base station wherein the time difference information of the reference time between,
    A physical cell identity of the target cell of the handover request message, by searching the cell information table by using the time difference information of the reference time between the target cell and the source cell, further candidates of the target cell refine,
    The handover control method according to claim 11 or 12, characterized in that.
  14. Said first relay and said second relay device, any one of claims 4,5,12 and 13, characterized in that setting the width for determining the time difference information of the reference time between cells and the same 1 the handover control method according to claim.
  15. Wherein the first relay device, using the cell information, handover control method according to any one of claims 1-14, wherein identifying a route to the target cell of the handover.
  16. The base station controller is connected to a connected communication network, a relay apparatus in which at least lower relay device is connected under at least one of the first base station is connected under the base station control device, wherein At least one of the second base station is connected under the lower relay device,
    Storage means for storing the cell information of the cell the second base station subordinate to the lower relay device controls,
    In hand-in phase of the handover to the second base station radio station from said first base station in the radio connection, and control means for using the cell information to identify the target cell of the handover,
    Relay apparatus characterized by having a.
  17. The cell information relay apparatus according to claim 16, characterized in that it comprises a logic cell identification information and the physical cell identification information identifying the cell of the second base station of the subordinate.
  18. The control means according to claim 17, characterized in that by using the physical cell identity of the target cell contained in the handover request message received from the base station controller and with said cell information, identifying the target cell relay device according to.
  19. The cell information further comprising: the physical cell identification information and the second base station uses the neighboring cells of the cell for controlling, and a time difference information of the reference time between the cell and the adjacent cells relay apparatus according to claim 17 or 18,.
  20. Wherein said control means includes a physical cell identity of the target cell contained in the handover request message received from the base station controller, and time difference information of the reference time between the target cell and the source cell, and the cell information using relay apparatus according to claim 19, wherein the identifying the target cell.
  21. Wherein, the relay device according to any one of claims 16-20, characterized in that inputs the cell information from the outside.
  22. It said control means from said lower relay device, in claim 21, characterized in that to receive the cell information using the base station registration message or the base station update message transmits the information about the second base station under its control relay device as claimed.
  23. Said control means from said lower relay device, using a handover request message of the hand-out phase to handover from the second base station to the first base station, according to claim 21, characterized in that receiving the cell information relay device according to.
  24. Handover request message of the hand-out phase, the physical cell identity of the source cell of the handover information element relating to the history information of the wireless station is set, the control means, a handover to be transmitted to the base station controller setting said normal residence time information in the information element related to the history information of the wireless station request message, the relay apparatus according to claim 23, characterized in that.
  25. Said storage means includes a logic cell identification information about the cell and the cell of the second base station of the base station immediately below the relay apparatus, the base station immediately below the, the address information of the second base station and the lower relay device holding the base station registration table that associates,
    Wherein said control means uses the logic cell identification information of the target cell of the handover request message received from the base station controller searches the base station registration table, identifies the destination address of the target cell and the handover request message to,
    Relay device according to any one of claims 16-24, characterized in that.
  26. Said storage means, adjacent a logic cell identification information of the cell of the first base station, said at least one logic cell identification information of at least one virtual cell including a second base station, a cell of the first base station a logic cell identification information of the cell of the second base station, the cell information table that associates held,
    Wherein the control unit searches the cell information table using the logical cell identification information of the target cell of the handover request message received from the base station controller, Filter candidate of the target cell,
    Relay device according to any one of claims 16-25, characterized in that.
  27. The cell information table further, the physical cell identification information neighbor cell of the cell of the second base station uses the physical cell identity cell of the second base station uses adjacent to cells of the first base station When, wherein the time difference information of the reference time between the second base station of the cell and its adjacent cells,
    The control means, by searching the cell information table by using the physical cell identification information of the target cell of the handover request message, and the time difference information of the reference time between the target cell and the source cell, the target further narrow the candidate of the cell,
    Relay apparatus according to claim 26, characterized in that.
  28. The cell information table further, the physical cell identification information other cells except for the cell and the cell of the first base station of the second base station uses the other cell and the second cell of the base station wherein the time difference information of the reference time between,
    The control means, by searching the cell information table by using the physical cell identification information of the target cell of the handover request message, and the time difference information of the reference time between the target cell and the source cell, the target further narrow the candidate of the cell,
    Relay apparatus according to claim 26 or 27, characterized in that.
  29. It said control means relay device according to any one of claims 19,20,27 and 28, characterized in that the time difference information of the reference time set the width to determine the same between cells.
  30. It said control means, by using the cell information, the relay apparatus according to any one of claims 16-29, wherein the identifying a route to the target cell of the handover.
  31. The base station controller and the first relay device is connected to the communication network, at least one first base station is connected under the base station controller, at least a second relay device connected under the first relay device is, a target cell selection method in the first relay apparatus in a wireless communication system in which at least one second base station is connected under the second relay device,
    Storage means stores the cell information of the cell the second base station under the control of the second switching device is controlled,
    Control means, in hand-phase handover to the second base station radio station from said first base station in a wireless connection, select a target cell of the handover using the cell information,
    Target cell selection method characterized by.
  32. The base station controller and the first relay device is connected to the communication network, at least one first base station is connected under the base station controller, at least a second relay device connected under the first relay device It is, at least one second base station is a connected wireless communication system under the second relay device,
    Wherein the first relay device, acquires cell information of the cell the second base station under the control of the second switching device is controlled,
    In hand-in phase of the handover to the second base station radio station from said first base station in a radio connection, the first relay device, using the cell information to identify the target cell of the handover,
    Wireless communication system, characterized in that.
PCT/JP2014/003058 2013-06-10 2014-06-09 Wireless communications system handover control method, relay device, and target cell selection method WO2014199621A1 (en)

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US14/897,166 US20160142952A1 (en) 2013-06-10 2014-06-09 Method of handover control, relay apparatus, and method for selecting target cell in radio communication system
EP14811167.7A EP3010282A4 (en) 2013-06-10 2014-06-09 Wireless communications system handover control method, relay device, and target cell selection method

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US20160142952A1 (en) 2016-05-19
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EP3010282A1 (en) 2016-04-20
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